Please read this. You either haven’t seen plenty of points that have already addressed your concerns or you’re just ignoring them.

https://steemit.com/steem/@ats-david/improved-curation-rewards-are-still-a-necessity

So the change from 25/75 to 50/50 would have an effect of reducing earnings of small accounts by about 30% and redistribute this income to whales and bots.

This is not true. It would only initially reduce rewards for those who rely solely on post rewards for “income.” As behavior and investment habits change, posting rewards could easily increase as a whole due to better incentives for buying and holding STEEM as SP.